Problem Statement: CE Board November 1993A 400-mm pipe can fill the tank alone in 5 hours and another 600-mm pipe can fill the tank alone in 4 hours. A drain pipe 300-mm can empty the tank in 20 hours. With all the three pipes open, how long will it take to fill the tank?
With three pipes open, it will 2.5 hours to fill the tank.Solution:
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